IAS General Studies Prelims Question No. 102

A rough sea can be calmed by pouring oil on its surface because __:
[A] The oil increases the surface tension of water
[B] The surface tension of the oil film absorbs energy of waves
[C] The winds creating waves are blocked by the oil film
[D] None of the reasons mentioned in A, B and C

Answer

[B] The surface tension of the oil film absorbs energy of waves
When the waves go underneath the film, the surface tension of the oil film makes them to lose some of the energy.

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